Rolling stock of railways, tramways, or road transport



July 15, 1930. 7 P. ALGRAIN 1,770,827

ROLLING STOCK OF RAILWAYS, TRAMWAYS, OH ROAD TRANSPORT Filed Dec. 22, 1928 Patented July 15, 1930 UNITED STATES PATENT orrica PAUL ALGRAIN, OF LA CROYERE, BELGIUM ROLLING STOCK OF RAILWAYS, TRAMWAYS R ROAD TRANSPORT Application filed December 22, 1928, Serial No. 328,035, and in Belgium February 23, 1928.

The present invention consists in improvements in or modifications of the rolling stock of railways, or tramways or of road transport described in United States Patent No.

1,715,264, granted May 28, 1929.

The rolling stock to which this prior specification relates comprises trucks of the Bissel type of which, in order that the vehicle should traverse a curved path with the minimum of 19 friction and wear of the rolling stock, the angular displacements relatively to the main frame of the end trucks about vertical pivots are controlled by one or more shafts to which an angular movement of rotation is imparted by the displacement of the central truck in a direction at right angles to the longitudinal axis of the vehicle frame.

In order to facilitate the rotary movement of the end bissels and the movements of translation of the central truck, the frame is carried on the end trucks by roller sectors pivoted in blocks rigidly secured to the frames of the trucks, the axes of the pivots, if prolonged, passing through the central vertical pivoting axis of the trucks, while the frame is carried on the central truck by roller sectors pivoting in blocks the axes of which are parallel to the axis of the main frame.

These roller sectors can rock under the action of gravity or of the inertia effects set up by shocks, if, for any reason, the contact between the supporting shoes of the frame and these sectors is broken. In this case, when the contact is reestablished, the sectors would no, longer be in their normal positions.

In order to avoid this drawback, according to the present invention a connection is pro vided between the frame and each roller sector, such that when the frame is no longer in contact with any sector, the angular displacement of this sector is controlled by the displacement of the frame equally as well as if the said contact still existed.

The accompanying drawing is a perspec- 45 tive view of a partial section of part of the rolling stock according to the invention provided with the connection which controls the angular position of the roller sectors according to the positionof'the frame.

The roller sector 31 can pivot in a socket 32 carried by an end Bissel truck 2'. The theoretical axis of rotation of the sector meets the axis of the central pivot 3 of the truck at a point 57 The frame rests on the rolling surface 31 of this sector by means of a supporting shoe 1*. In order that when this shoe temporarily loses contact with the sector 31, the latter, under the action of gravity or other force, should not rock and when the contact is reestablished take up a position other than its normal position between the sector and the supporting shoe a connection is provided which controls the angular displacements of the sector in the same way as if it were still in contact with the shoe. 7

For this purpose the shoe 1 has laterally a truncated conical surface 1 having the point 57 as vertex and the axis of the pivot 3 as axis. The roller sector 31 has a truncated conical surface 31 having the point 57 as vertex but the theoretical axis of rotation of the sector as axis. These two truncated surfaces, which correspond like the contact surfaces of conical frictional driving plates, are separated by a distance suiiicient to allow the insertion between them of two metallic flexible bands 58 and 59. The band 58 is partially rolled on the truncated conical surface 81. in a plane perpendicular to the axis of rotation of the socket. It is also rolled off the truncated conical surface 1 in a plane perpendicular to the axis of rotation of the truck. The band 59 is rolled in the same way as the band 58, but symmetrically to the latter relatively to the vertical plane passing through the point of contact of the shoe 1 and of the sector 31 when the latter is in its mean angular position. The length of the mean winding radii of these bands is the distance which separates the centre of their sections in the said plane from the point 57. Consequently, if these bands have one of their ends fixed to the sector and the other end to the shoe (1 the rolling of the shoe 1 on the sector 31 is in no way obstructed by the bands 58 and 59. Each of these is always applied to both of the truncated conical surfaces, the respective arcs of contact varying with the angular position of the sector.

a name to this specification.

On the other hand, if the shoe 1 leaves the sector 31, the bands 58 and 59 prevent thi sector from being angularly displaced. F urther, by their resistance to extension they prevent such detachment.

In the case of the central truck, the centre of the curve of displacement of pivot 3 is at infinity, because this displacement is rectilineal. The truncated conical surface 1 becomes a plane surface and the truncated surface 31 becomes a cylindrical surface, having the theoretical axis of the socket as axis.

Having thus described the nature of the said invention and the best means I know of carrying the same into practical effect, I claim 1. A rolling stock for railways, tramways and road transport vehicles comprising in combination an end Bissel truck, a main vehicle frame, a socket secured to the end Bissel truck, a roller sector pivoted in said socket, a shoe on said frame supported by said roller sector, flexible connections partly wrapped on said roller sector, each of said connections be ing secured at one end to said shoe and at the opposite end to said sector.

2. A rolling stock for railways, tramways and road transport vehicles according to claim 1, in which each flexible connection is attached to one lateral end surface of the shoe and to the opposite end of the roller sector.

3. A rolling stock for railways, tramways and road transport vehicles according to claim 1, in which each flexible connection is partly wound on the roller sector in a plane perpendicular to the axis of rotation of the socket and off the surface of the shoe in a plane perpendicular to the axis of rotation of the truck. 7

4. A rolling stock for railways, tramways, and road transport vehicles according to claim 1, in which the arcs of contact of the flexible connections with the roller surface are symmetrical with respect to a vertical plane passing through the central surface of the sector when the latter is in its mean position.

5. A rolling stock for railways, tramways and road transport vehicles according to claim 1, comprising truncated conical surfaces on the shoe and on the sector, the vertices of the said surfaces being on the axis of rotation of the truck.

In testimony whereof I have signed my PAUL ALGRAIN. 

